“…During the dephosphorization process of the converter, as the temperature of the hot metal rises and the dephosphorization reaction proceeds, carbon and phosphorus will undergo a selective oxidation transformation. The selective oxidation reaction of carbon and phosphorus is shown in Equation (5). Namely, when the temperature is lower than the selective oxidation temperature of carbon and phosphorus, the phosphorus in hot metal is preferentially oxidized.…”
Section: Effect Of Dephosphorization Endpoint Temperature On a Feo And P P−c Comentioning
confidence: 99%
“…In the hot metal dephosphorization reaction, the slag is in the state of solid-liquid multiphase coexistence. While lime dissolves, 2CaO•SiO 2 (C 2 S) is formed [5]. C 2 S tends to combine with 3CaO•P 2 O 5 (C 3 P) in liquid slag to form solid solution 2CaO•SiO 2 -3CaO•P 2 O 5 (C 2 S-C 3 P) [6,7].…”
In the present work, the effect of dephosphorization endpoint temperature on the dephosphorization of hot metal was studied for the double slag converter steelmaking process under the conditions of low temperature and low basicity by the industrial experiments. In the temperature range of 1350–1450 °C, with an increasing dephosphorization endpoint temperature, the dephosphorization ratio and phosphorus distribution ratio first increase and then decrease. The phosphorus content in hot metal first decreases and then increases at the end of dephosphorization. At the dephosphorization temperature range of 1385–1410 °C, the dephosphorization ratio is higher than 55%, the P2O5 content in the dephosphorization slag is 3.93–4.17%, the logLP value is 1.76–2.09, the value of PCOP-C of the selective oxidation reaction of carbon and phosphorus is 53–80 Pa, and the aFeO value is 0.284–0.312. The path of phosphorus in hot metal entering the P-rich phase of dephosphorization slag can be reasonably inferred as: hot metal → Fe-rich phase → P-rich phase. Under the present industrial experimental conditions, the dephosphorization and rephosphorization reactions are in dynamic equilibrium at 1413 °C. Considering the experimental results and thermodynamic calculation results of industrial experiments by the double slag dephosphorization process, the optimal temperature range for intermediate deslagging is about 1400–1420 °C.
“…During the dephosphorization process of the converter, as the temperature of the hot metal rises and the dephosphorization reaction proceeds, carbon and phosphorus will undergo a selective oxidation transformation. The selective oxidation reaction of carbon and phosphorus is shown in Equation (5). Namely, when the temperature is lower than the selective oxidation temperature of carbon and phosphorus, the phosphorus in hot metal is preferentially oxidized.…”
Section: Effect Of Dephosphorization Endpoint Temperature On a Feo And P P−c Comentioning
confidence: 99%
“…In the hot metal dephosphorization reaction, the slag is in the state of solid-liquid multiphase coexistence. While lime dissolves, 2CaO•SiO 2 (C 2 S) is formed [5]. C 2 S tends to combine with 3CaO•P 2 O 5 (C 3 P) in liquid slag to form solid solution 2CaO•SiO 2 -3CaO•P 2 O 5 (C 2 S-C 3 P) [6,7].…”
In the present work, the effect of dephosphorization endpoint temperature on the dephosphorization of hot metal was studied for the double slag converter steelmaking process under the conditions of low temperature and low basicity by the industrial experiments. In the temperature range of 1350–1450 °C, with an increasing dephosphorization endpoint temperature, the dephosphorization ratio and phosphorus distribution ratio first increase and then decrease. The phosphorus content in hot metal first decreases and then increases at the end of dephosphorization. At the dephosphorization temperature range of 1385–1410 °C, the dephosphorization ratio is higher than 55%, the P2O5 content in the dephosphorization slag is 3.93–4.17%, the logLP value is 1.76–2.09, the value of PCOP-C of the selective oxidation reaction of carbon and phosphorus is 53–80 Pa, and the aFeO value is 0.284–0.312. The path of phosphorus in hot metal entering the P-rich phase of dephosphorization slag can be reasonably inferred as: hot metal → Fe-rich phase → P-rich phase. Under the present industrial experimental conditions, the dephosphorization and rephosphorization reactions are in dynamic equilibrium at 1413 °C. Considering the experimental results and thermodynamic calculation results of industrial experiments by the double slag dephosphorization process, the optimal temperature range for intermediate deslagging is about 1400–1420 °C.
“…For the decomposition of CaCO 3 , heat transfer is necessary. Therefore, the thermal conductivity of the solid solution of 2CaO•SiO 2 and 3CaO•P 2 O 5 was measured (Kobayashi et al 2017) and showed that the measured value was almost half of that of pure CaO. By using this result, the heat transfer rate in the quick lime particle was calculated.…”
Section: Enhancement Of the Lime Dissolutionmentioning
confidence: 99%
“…(2017), used with permission. Figure 16 Calculated heat transfer rate in the quick lime by Kobayashi et al. (2017), used with permission.…”
Section: Fundamental Researches Related To the Converter Technology I...mentioning
In this paper, the history and latest trends in the converter-based steelmaking process in Japan were summarised. After World War II, Japanese steel companies introduced the LD converter, and various original technologies have been developed to increase productivity, reduce the production cost, and improve the quality of steel. About 20 years after the introduction, the necessity of the additional stirring was recognised and various types of top-and-bottomblowing converters were developed. By using this process, hot-metal dephosphorisation and smelting reduction were developed. In addition, fundamental research related to the converter technology is shown. Japanese steelmaking technology has been developed by the collaboration of university and industry. In industry, each company has an R&D centre where the applied and practical research is conducted. The research in academia is concentrated on the fundamentals. Recently, ISIJ organised the research projects on 'multiphase slag refining' and 'enhancement of lime dissolution'.
“…Porém, ao se adicionar a cal a temperatura ambiente, ocorre a precipitação e formação de camadas sólidas entorno da partícula de cal (uma vez que a escória a base de SiO 2 -FeO-MgO está na temperatura de trabalho). Kobaiashi et al 6,7 afirmam que o aumento na % de FeO eleva a condutividade térmica na escória, o que ajuda a dissolver mais rápido a camada de 2CaO.SiO 2 formada envolta da partícula de cal (uma vez q essa camada apresenta uma baixa condutividade térmica, aproximadamente 0,65W/m•K, que é menor que a da cal, que é 1,5 W/m•K). Sendo assim, ocorre uma transferência de calor mais rápida na escória, o que ajuda a dissolver e eliminar a camada sólida de 2CaO.SiO 2 , elevando a velocidade de dissolução da cal.…”
Section: Mistura Base E Adição De 5% De Feounclassified
Resumo O foco deste estudo é avaliar a capacidade de dissolução das partículas de cal a uma temperatura próxima da fase inicial de sopro do processo BOF. Os testes foram realizados em um forno elétrico utilizando amostras de Cal com diâmetros de 9 mm, de forma a se comparar a influência da variação da basicidade binária (1,5; 2,5 e 3,5), da porcentagem de calcinação (60%, 80% e 100% calcinadas) e aumento de 5% em massa de FeO nas misturas. Os resultados mostram que com o 80% de calcinação a dissolução foi maior. Podendo ser atribuído a algumas diferenças na porosidade da cal ou um efeito de formação de espuma observado durante os testes devido à evolução do CO 2 da calcinação restante. O aumento na basicidade da escória resultou na redução da taxa de dissolução que pode ser atribuída a uma precipitação de fase sólida mais densa na interface das partículas aumentando a viscosidade da escória e reduzindo a porosidade da partícula.
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